Structure of Atom Part 1

For the Balmer series in the spectrum of Hatom, v=RH{

1

n12

−

1

n22

}, the correct statements among (I) and (IV) are :
(I) As wavelength decreases, the lines in the series converge
(II) The integer n, is equal to 2
(III) The lines of longest wavelength corresponds to n2=3
(IV) The ionization energy of hydrogen can be calculated from wave number of these lines